HttpWebResponse.GetResponseHeader メソッド

.NET Framework クラス ライブラリ リファレンス

HttpWebResponse.GetResponseHeader メソッド

応答で返されたヘッダーの内容を取得します。

名前空間: System.Net
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public Function GetResponseHeader ( _
    headerName As String _
) As String

Visual Basic (使用法)

Dim instance As HttpWebResponse
Dim headerName As String
Dim returnValue As String

returnValue = instance.GetResponseHeader(headerName)

C#

public string GetResponseHeader (
    string headerName
)

C++

public:
String^ GetResponseHeader (
    String^ headerName
)

J#

public String GetResponseHeader (
    String headerName
)

JScript

public function GetResponseHeader (
    headerName : String
) : String

パラメータ

headerName

返されるヘッダー値。

戻り値
指定したヘッダーの内容。

例外

例外の種類	条件
ObjectDisposedException	現在のインスタンスは破棄されています。

解説

GetResponseHeader を使用して、特定のヘッダーの内容を取得します。どのヘッダーを返すかを指定する必要があります。

使用例

この例では、Web 要求を作成し、応答を問い合わせます。サイトが認証を必要とする場合、この例では、チャレンジ文字列で応答します。この文字列は、GetResponseHeader を使用して抽出されます。

Visual Basic

Public Shared Sub GetPage(url
 As [String])
Try
        Dim ourUri As New
 Uri(url)
        ' Creates an HttpWebRequest for the specified URL. 
        Dim myHttpWebRequest As HttpWebRequest
 = CType(WebRequest.Create(ourUri), HttpWebRequest)
        Dim myHttpWebResponse As HttpWebResponse
 = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
        Console.WriteLine(ControlChars.NewLine + "The server did
 not issue any challenge.  Please try again with a protected resource URL.")
        ' Releases the resources of the response.
        myHttpWebResponse.Close()
    Catch e As WebException
        Dim response As HttpWebResponse = CType(e.Response,
 HttpWebResponse)
        If Not (response Is
 Nothing) Then
            If response.StatusCode = HttpStatusCode.Unauthorized
 Then
                Dim challenge As String
 = Nothing
                challenge = response.GetResponseHeader("WWW-Authenticate")
                If Not (challenge Is
 Nothing) Then
                    Console.WriteLine(ControlChars.NewLine + "The
 following challenge was raised by the server:{0}", challenge)
                End If
            Else
                Console.WriteLine(ControlChars.NewLine + "The
 following exception was raised : {0}", e.Message)
            End If
        Else
            Console.WriteLine(ControlChars.NewLine + "Response
 Received from server was null")
        End If 
    Catch e As Exception
        Console.WriteLine(ControlChars.NewLine + "The following
 exception was raised : {0}", e.Message)
    End Try
End Sub 

C#

   public static void GetPage(String
 url) 
    {
    try 
             {    
                Uri ourUri = new Uri(url);
                // Creates an HttpWebRequest for the specified URL.
 
                HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(ourUri);
 
                HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
                Console.WriteLine("\nThe server did not issue any challenge.
  Please try again with a protected resource
 URL.");
                // Releases the resources of the response.
                myHttpWebResponse.Close(); 
            } 
        catch(WebException e) 
           {
                HttpWebResponse response = (HttpWebResponse)e.Response;
                if (response != null)
                {
                    if (response.StatusCode == HttpStatusCode.Unauthorized)
                    {
                        string challenge = null;
                        challenge= response.GetResponseHeader("WWW-Authenticate");
                        if (challenge != null)
                            Console.WriteLine("\nThe following challenge was
 raised by the server:{0}",challenge);
                    }
                    else
                        Console.WriteLine("\nThe following WebException was
 raised : {0}",e.Message);
                }
                else
                    Console.WriteLine("\nResponse Received from server was null");

            }
        catch(Exception e)
        {
            Console.WriteLine("\nThe following Exception was raised : {0}"
,e.Message);
        }
    }
}

C++

void GetPage( String^ url )
{
   try
   {
      Uri^ ourUri = gcnew Uri( url );
      // Creates an HttpWebRequest for the specified URL.
      HttpWebRequest^ myHttpWebRequest = (HttpWebRequest^)( WebRequest::Create( ourUri
 ) );
      HttpWebResponse^ myHttpWebResponse = (HttpWebResponse^)( myHttpWebRequest->GetResponse()
 );
      Console::WriteLine( "\nThe server did not issue any challenge.  Please
 try again with a protected resource URL."
 );
      // Releases the resources of the response.
      myHttpWebResponse->Close();
   }
   catch ( WebException^ e ) 
   {
      HttpWebResponse^ response = (HttpWebResponse^)( e->Response );
      if ( response != nullptr )
      {
         if ( response->StatusCode == HttpStatusCode::Unauthorized
 )
         {
            String^ challenge = nullptr;
            challenge = response->GetResponseHeader( "WWW-Authenticate"
 );
            if ( challenge != nullptr )
                        Console::WriteLine( "\nThe following challenge was raised
 by the server: {0}", challenge );
         }
         else
         {
            Console::WriteLine( "\nThe following WebException was raised : {0}",
 e->Message );
         }
      }
      else
      {
         Console::WriteLine( "\nResponse Received from server was 0" );
      }
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "\nThe following Exception was raised : {0}",
 e->Message );
   }
}

J#

    public static void GetPage(String
 url)
    {
        try {
            Uri ourUri = new Uri(url);
            // Creates an HttpWebRequest for the specified URL. 
            HttpWebRequest myHttpWebRequest = (HttpWebRequest)
                WebRequest.Create(ourUri);
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)
                myHttpWebRequest.GetResponse();
            Console.WriteLine("\nThe server did not issue any challenge.  "
                + "Please try again with a protected
 resource URL.");
            // Releases the resources of the response.
            myHttpWebResponse.Close();
        }
        catch (WebException e) {
            HttpWebResponse response = (HttpWebResponse)e.get_Response();
            if (response != null) {
                if (response.get_StatusCode().Equals(HttpStatusCode.
                    Unauthorized)) {
                    String challenge = null;
                    challenge = response.GetResponseHeader("WWW-Authenticate");
                    if (challenge != null)
 {
                        Console.WriteLine("\nThe following challenge was "
                            + "raised by the server:{0}", challenge);
                    }
                }
                else {
                    Console.WriteLine("\nThe following WebException "
                        + "was raised : {0}", e.get_Message());
                }
            }
            else {
                Console.WriteLine("\nResponse Received from server was null");
            }
        }
        catch (System.Exception e) {
            Console.WriteLine("\nThe following Exception was raised : {0}"
,
                e.get_Message());
        }
    } //GetPage
} //HttpWebResponseSnippet

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
HttpWebResponse クラス
HttpWebResponse メンバ
System.Net 名前空間